Grille structure



FIG. 1 is a top, front, right side perspective view of a first embodiment of a grille structure showing our new design;

FIG. 2 is a front elevation view thereof; the rear elevation view being identical;

FIG. 3 is a right side elevation view thereof; the left side elevation view being identical;

FIG. 4 is a top plan view thereof;

FIG. 5 is a top, front, right side perspective view of a second embodiment of a grille structure showing our new design;

FIG. 6 is a top plan view of a third embodiment of a grille structure showing our new design; and,

FIG. 7 is a top plan view of a fourth embodiment of a grille structure showing our new design.

In the drawings, the broken lines in FIGS. depict portions of the article that form no part of the claim. 

CLAIM The ornamental design for a grille structure, as shown and described. 